I didn't want to extend the years old discussion on this thread,
http://www.houseoffusion.com/groups/cf-talk/thread.cfm/threadid:19468
I was looking for a custom tag which given two lists list1,list2 will give me
back a struct with two lists 'toadd' and 'todelete'.
toadd -- elements from list2 to be added to list1
todelete -- elements from list1 to be deleted (those that are not present in
list2)
I wrote two versions, one based on lists and the other based on struct, in all
cases (even smaller sizes), struct version outperforms list version.
Anyone care to comment? Both versions given below:
STRUCT VERSION:
<!--- usage
<cf_listcompare list1="#list1#" list2="#list2#" returnvariable="abc"
delimiter=",">
--->
<cfparam name="attributes.list1" default="" type="string">
<cfparam name="attributes.list2" default="" type="string">
<cfparam name="attributes.delimiter" default=",">
<cfparam name="attributes.returnvariable" type="variablename" default="result">
<cfset caller[attributes.returnvariable]=structnew()>
<cfset struct1 = structnew()>
<cfset struct2 = structnew()>
<cfloop list="#attributes.list1#" index="idx"
delimiters="#attributes.delimiter#">
<cfset structinsert(struct1,"#idx#","","yes")>
</cfloop>
<cfset list1=structkeylist(struct1,"#attributes.delimiter#")>
<cfloop list="#attributes.list2#" index="idx"
delimiters="#attributes.delimiter#">
<cfset structinsert(struct2,"#idx#","","yes")>
</cfloop>
<cfset list2=structkeylist(struct2,"#attributes.delimiter#")>
<cfif attributes.list1 neq "" or attributes.list2 neq "">
<cfset toadd = structnew()>
<cfset todelete = structnew()>
<cfloop list="#list2#" index="idx" delimiters="#attributes.delimiter#">
<cfif not structkeyexists(struct1,"#idx#")>
<cfset structinsert(toadd,"#idx#","")>
</cfif>
</cfloop>
<cfloop list="#list1#" index="idx" delimiters="#attributes.delimiter#">
<cfif not structkeyexists(struct2,"#idx#")>
<cfset structinsert(todelete,"#idx#","")>
</cfif>
</cfloop>
<cfset
structinsert(caller[attributes.returnvariable],"toadd","#structkeylist(toadd,attributes.delimiter)#")>
<cfset
structinsert(caller[attributes.returnvariable],"todelete","#structkeylist(todelete,attributes.delimiter)#")>
</cfif>
LIST VERSION:
<cfparam name="attributes.list1" default="" type="string">
<cfparam name="attributes.list2" default="" type="string">
<cfparam name="attributes.delimiter" default=",">
<cfparam name="attributes.returnvariable" type="variablename" default="result">
<cfset caller[attributes.returnvariable]=structnew()>
<cfif attributes.list1 neq "" or attributes.list2 neq "">
<cfset toadd = "">
<cfset todelete = "">
<cfloop list="#attributes.list2#" index="idx"
delimiters="#attributes.delimiter#">
<cfif not
listfind(attributes.list1,idx,"#attributes.delimiter#") and not
listfind(toadd,idx,"#attributes.delimiter#")>
<cfset toadd =
listappend(toadd,idx,"#attributes.delimiter#")>
</cfif>
</cfloop>
<cfloop list="#attributes.list1#" index="idx"
delimiters="#attributes.delimiter#">
<cfif not
listfind(attributes.list2,idx,"#attributes.delimiter#") and not
listfind(todelete,idx,"#attributes.delimiter#")>
<cfset todelete =
listappend(todelete,idx,"#attributes.delimiter#")>
</cfif>
</cfloop>
<cfset
structinsert(caller[attributes.returnvariable],"toadd","#toadd#")>
<cfset
structinsert(caller[attributes.returnvariable],"todelete","#todelete#")>
</cfif>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
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